feat: implement BackButton component for consistent navigation

- Added BackButton component to standardize back navigation across pages.
- Integrated BackButton into various pages, replacing custom back buttons for consistency.
- Updated PageHeader to accept backTo prop for displaying BackButton when navigating from subpages.
- Created useGoBack hook to handle navigation logic, determining whether to go back in history or redirect to a fallback page.
- Added tests for BackButton and its integration with PageHeader to ensure expected behavior.

assets/admin/components/PatientCaseBanner.tsx

@@ -1,7 +1,7 @@
-import { Link } from 'react-router-dom';
 import { formatDate } from '../lib/utils';
+import BackButton from './ui/BackButton';
 import {
-  ArrowLeftPH, ArrowLeftD, FilesServicePhone, FilesServiceCalendar,
+  ArrowLeftD, FilesServicePhone, FilesServiceCalendar,
   FilesServiceNotification, FilesServiceMessage,
 } from './icons/FilesServiceIcons';
 
@@ -11,10 +11,7 @@ interface Tag { uuid: string; name: string; color: string }
 export function Breadcrumb({ name, backTo }: { name: string; backTo: string }) {
   return (
     <div style={{ display: 'flex', alignItems: 'center', gap: 8, color: 'var(--text-2)', fontSize: 12, marginBottom: 14 }}>
-      <Link to={backTo} className="bg-[var(--surface)]" style={{ display: 'flex', alignItems: 'center', gap: 4, padding: '6px 8px', borderRadius: 12, cursor: 'pointer', color: 'var(--text-2)', textDecoration: 'none' }}>
-        <ArrowLeftPH />
-        <span>بازگشت</span>
-      </Link>
+      <BackButton fallback={backTo} />
       <ArrowLeftD />
       <span>پرونده</span>
       <ArrowLeftD />